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	<title>Christopher Patton &#8211; Noise</title>
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		<title>8 eMudhra certificates are compromised. Here&#8217;s what you need to know</title>
		<link>https://noise.getoto.net/2026/10/21/8-emudhra-certificates-are-compromised-heres-what-you-need-to-know/</link>
		
		<dc:creator><![CDATA[Christopher Patton]]></dc:creator>
		<pubDate>Tue, 20 Oct 2026 22:20:16 +0000</pubDate>
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					<description><![CDATA[Following the discovery that eight eMudhra intermediate certificates use weak keys, Cloudflare is deploying mitigations and releasing client updates. We explain the impact, our response, and what customers and developers should do next.]]></description>
		
		
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		<title>Preventing quantum downgrade attacks against IPsec</title>
		<link>https://noise.getoto.net/2026/09/29/preventing-quantum-downgrade-attacks-against-ipsec/</link>
		
		<dc:creator><![CDATA[Christopher Patton]]></dc:creator>
		<pubDate>Tue, 29 Sep 2026 13:00:00 +0000</pubDate>
				<category><![CDATA[Attacks]]></category>
		<category><![CDATA[Birthday Week]]></category>
		<category><![CDATA[Cryptography]]></category>
		<category><![CDATA[IPsec]]></category>
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					<description><![CDATA[A sophisticated attacker with a quantum computer can exploit a protocol design flaw to downgrade post-quantum IPsec tunnels to classical crypto. We helped the IETF develop a transcript authentication extension to prevent these attacks.]]></description>
		
		
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		<title>Prepping for post-quantum: a beginner’s guide to lattice cryptography</title>
		<link>https://noise.getoto.net/2025/03/21/prepping-for-post-quantum-a-beginners-guide-to-lattice-cryptography/</link>
		
		<dc:creator><![CDATA[Christopher Patton]]></dc:creator>
		<pubDate>Fri, 21 Mar 2025 13:00:00 +0000</pubDate>
				<category><![CDATA[Cryptography]]></category>
		<category><![CDATA[post quantum]]></category>
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					<description><![CDATA[This post is a beginner's guide to lattices, the math at the heart of the transition to post-quantum (PQ) cryptography. It explains how to do lattice-based encryption and authentication from scratch.]]></description>
		
		
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		<title>Privacy-preserving measurement and machine learning</title>
		<link>https://noise.getoto.net/2023/09/29/privacy-preserving-measurement-and-machine-learning/</link>
		
		<dc:creator><![CDATA[Christopher Patton]]></dc:creator>
		<pubDate>Fri, 29 Sep 2023 13:00:45 +0000</pubDate>
				<category><![CDATA[Birthday Week]]></category>
		<category><![CDATA[machine learning]]></category>
		<category><![CDATA[Privacy]]></category>
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					<description><![CDATA[Cloudflare is implementing DAP (Distributed Aggregation Protocol) – a way of aggregating data without exposing individual measurements that uses  multi-party computation]]></description>
		
		
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		<title>Good-bye ESNI, hello ECH!</title>
		<link>https://noise.getoto.net/2020/12/08/good-bye-esni-hello-ech/</link>
		
		<dc:creator><![CDATA[Christopher Patton]]></dc:creator>
		<pubDate>Tue, 08 Dec 2020 12:00:00 +0000</pubDate>
				<category><![CDATA[DNS]]></category>
		<category><![CDATA[Privacy]]></category>
		<category><![CDATA[Privacy Week]]></category>
		<category><![CDATA[protocols]]></category>
		<category><![CDATA[research]]></category>
		<category><![CDATA[TLS]]></category>
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					<description><![CDATA[A deep dive into the Encrypted Client Hello, a standard that encrypts privacy-sensitive parameters sent by the client, as part of the TLS handshake.]]></description>
		
		
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